The target will be constrained to the bottom edge. Its width will be
altered to fit to the width of the container. Its height will
remain unchanged.

Consider the BOTTOM constraint to work like a page's
footer. It appears below all other constrained children, with no other
children appearing to the left or right. Multiple BOTTOM constraints
will be arranged vertically from the bottom up in the order that they
were registered as clients of the BorderLayout algorithm.

CENTER

constant

public static const CENTER:String = "center"

The target will be constrained to the center of the container. It
will appear between all other constrained children. Its height will be
altered to fill the remaining height of the container (after the TOP
and BOTTOM constraints are measured) and its width will be altered to
fill the remaining width of the container (after the LEFT and RIGHT
constraints are measured).

Consider the CENTER constraint to work like a page's
primary content. It appears in between all other constraints and changes
size to fill the remaining area (after all other constraints are
measured). Multiple CENTER constraints will be arranged
vertically from top down starting from the bottom edge of the
TOP constraints to the top edge of any BOTTOM
constraints.

LEFT

constant

public static const LEFT:String = "left"

The target will be constrained to the left edge. It will appear
below any items constrained to the top and above items constrained to
the bottom. Its height will be altered to fill the remaining height
of the container (after the TOP and BOTTOM constraints are measured),
and its width will remain unchanged.

Consinder the LEFT constraint to work like a page's
sidebar that is aligned to the left. It appears to the left of all other
children, with only the top and bottom constraints taking precendence.
Multiple LEFT constraints will be arranged horizontally
from left to right in the order that they were registered as clients
of the BorderLayout algorithm.

RIGHT

constant

public static const RIGHT:String = "right"

The target will be constrained to the right edge. It will appear
below any items constrained to the top and above items constrained to
the bottom. Its height will be altered to fill the remaining height
of the container (after the TOP and BOTTOM constraints are measured),
and its width will remain unchanged.

Consinder the RIGHT constraint to work like a page's
sidebar that is aligned to the right. It appears to the right of all other
children, with only the top and bottom constraints taking precendence.
Multiple RIGHT constraints will be arranged horizontally
from right to left in the order that they were registered as clients
of the BorderLayout algorithm.

TOP

constant

public static const TOP:String = "top"

The target will be constrained to the top edge. Its width will be
altered to fit to the width of the container. Its height will
remain unchanged.

Consider the TOP constraint to work like a page's
header. It appears above all other constrained children, with no other
children appearing to the left or right. Multiple TOP constraints
will be arranged vertically from the top down in the order that they
were registered as clients of the BorderLayout algorithm.